i have a whining noise

[mercman111]

on my 350 clk w209 i have a whining noise coming from the front by the belt (what is it)

 

[Steve@Avantgarde]

Can you post an audio file?

Could be the belt, a pulley on which it rolls or a component that the belt drives.

 

[Blobcat]

I had whining from the top idler pulley on my M272 just before it gave up the ghost completely. Changed it and it was quite, until the tensioner started making a noise a week later. Changed that as well and all good since

 

[rorywquin]

I have a whining noise next to me on the sofa...........

 

[mioba]

I have a whining noise next to me on the sofa...........

I was scrolling the post and just about to post something similar. Beat me to it.

 

[Blobcat]

I was scrolling the post and just about to post something similar. Beat me to it.

I bet she did…

 

[mercman111]

its very faint

 

[mercman111]

i sprayed wd40 0n the belt and all the pulleys that the belt runs on ,but the noise is still there

 

[Blobcat]

i sprayed wd40 0n the belt and all the pulleys that the belt runs on ,but the noise is still there

Have a read of the below thread

M272 Serpentine Belt Idler and Tensioner failure and replacement

Sat waiting for garage door to open tonight and thought “that’s a strange noise the door is making”. Then realised I could smell plastic burning... :( Engine off, bonnet open, front engine cover off and bits of belt strewn around :( Top idler wheel completely gone... You can see bits of...

forums.mercedesclub.org.uk

 

[mioba]

i sprayed wd40 0n the belt and all the pulleys that the belt runs on ,but the noise is still there

You sprayed wd40 on the actual serpentine belt?????.... oh dear.

Wd will do nothing to shot pully bearings.

you need to take the belt off and check each pully for play/noise and replace accordingly.

The tensioner may be shot and its a few bolts but not easy to access depending on the engine/car.

 

[rifiki]

If it's original change it. It let go, M272, with no warning and shredded the belt and wrapped it's self round
the crank shaft between pulley and block causing more problems. Should be service item, 10 years/100K miles.

 

[mioba]

Serpentines are actually checked at service time and advised if a change is required.

Definately agree on the 10 years, and since its been sprayed in WD40 and will need to come off to check the pullies - it will need changing now.

 

[mercman111]

ive bought a stethescope to be on the safe side it came today

 

[mercman111]

i put the stethescope on and it sounded the same on every pulley

 

[LostKiwi]

Take off the belt (after noting how it goes round the pulleys) and start the engine (only run briefly).
No noise then it's a pulley.
Spin each by hand feeling for roughness. If it feels rough you have your culprit.

 

[rifiki]

Service item 10 years 100K miles, it actually let go at around 80K miles.
You will be surprised how small the bearing is.

 

[mioba]

A stethoscope on a rotating pulley. Hows that work then.

Take pictures of how the belt is in. remove it. lots of vids on you tube.

Spin each pully by hand. should be no noise. Grapple each pully. There should
be no play.

they are easy to change if you are able (limited space) make sure you have the torque setting for the bolts and get a new belt and clean all those pulleys.

like said - loads of info on you tube.

 

[mercman111]

theres no play or noise from anywhere from the pulleys

 

[LostKiwi]

theres no play or noise from anywhere from the pulleys

Is the whining there with the belt off?

 

[mercman111]

no,ihave renewed the belt no difference